FEICHUN CABLE6/10 kV REELING3×120 mm²2×70/2 EARTH18FOMEDIUM VOLTAGEPOWER + DATARFQ ENGINEERING GUIDE
6/10KV REELING CABLE 3CX120 & 2CX70/2+18FO — integrated medium-voltage power, earth and optical-fibre reeling cable
The supplied procurement description identifies a composite reeling cable with a 6/10 kV rating, three nominal 120 mm² power cores, a 2CX70/2 earth-conductor notation and an integrated 18FO optical-fibre count. The working engineering notation is 6/10 kV reeling cable — 3×120 + 2×70/2 + 18FO. This article preserves the buyer string exactly, explains the design questions it creates and keeps all unprovided construction, dimension, rating, fibre and certification values as project-confirmation fields.
Voltage class
6/10 kV
Medium-voltage rating supplied by the buyer.
Power cores
3×120
Three nominal 120 mm² power cores.
Earth notation
2×70/2
Split earth-conductor notation; exact layout requires the drawing.
Optical channel
18FO
18 optical fibres; grade, buffer and connector interface are TBC.
Contents
- Engineering position
- How to read the designation
- Evidence and source hierarchy
- Reference architecture
- Power, earth and fibre topology
- Exact target data matrix
- Electrical design boundary
- Optical-fibre engineering
- Reeling mechanics
- Application scenes
- Installation and failure controls
- Feichun functional equivalent
- Certification and documents
- RFQ release checklist
- Source audit
1. Engineering position: one cable, three different reliability problems
The 120 mm² copper is only one part of the engineering problem. A 6/10 kV reeling cable with an earth path and 18 optical fibres has to maintain MV insulation integrity, protective continuity and optical transmission while the complete assembly is repeatedly bent, pulled, compressed and guided through a machine. The cable body, reel, transition zone and terminations must be treated as one system.
MV power function
Coordinate conductor resistance, insulation system, screens, voltage drop, short-circuit duty, terminations and system earthing for the 6/10 kV circuit.
Coordinate conductor resistance, insulation system, screens, voltage drop, short-circuit duty, terminations and system earthing for the 6/10 kV circuit.
Protective-earth function
Preserve the intended low-impedance fault-current path through the 2×70/2 arrangement without allowing the earth conductors to become an uncontrolled pulling member.
Preserve the intended low-impedance fault-current path through the 2×70/2 arrangement without allowing the earth conductors to become an uncontrolled pulling member.
Optical function
Protect 18 fibres from tensile strain, microbending, macrobending, crushing, moisture and termination damage while the power cores are moving.
Protect 18 fibres from tensile strain, microbending, macrobending, crushing, moisture and termination damage while the power cores are moving.
Reeling function
Control drum geometry, layer pressure, fleet angle, acceleration, torsion, guide contact, mass and end restraint.
Control drum geometry, layer pressure, fleet angle, acceleration, torsion, guide contact, mass and end restraint.
Data rule: the supplied description does not release conductor material/class, insulation or sheath compound, screen structure, outer diameter, mass, current rating, dynamic radius, travel speed, optical grade, test voltage or certificate scope. None of those values is invented in this article.
2. How to read the designation
| Raw field | Engineering reading | Quotation consequence | Status |
|---|---|---|---|
| 6/10KV REELING CABLE | A 6/10 kV medium-voltage cable intended for repeated machine movement. | Confirm system earthing, Uₘ, test level, travel mode, reel geometry and dynamic qualification. | User-supplied |
| 3CX120 | Three nominal 120 mm² power cores; the letter X is retained as buyer spelling rather than treated as a complete type code. | Confirm conductor material, flexibility class, insulation, semi-conductive screens and core identification. | User-supplied / interpretation |
| 2CX70/2 | Two earth-related sections described by the 70/2 notation. | Confirm whether the notation means two separate 70/2 sections, the actual copper area, screen relationship and termination method. | User-supplied / drawing required |
| +18FO | An integrated optical unit containing 18 fibres, subject to confirmation of the fibre construction. | Specify multimode/singlemode, fibre grade, buffer/tube, attenuation, bandwidth, wavelength, connector and test method. | User-supplied / interpretation |
Normalised search phrase
6/10 kV 3×120 + 2×70/2 + 18FO medium-voltage reeling cableWhat must not be assumed
Do not assume a specific brand, model code, cable standard, rubber compound, fibre mode, screen type, current rating or minimum radius from the short description.
Do not assume a specific brand, model code, cable standard, rubber compound, fibre mode, screen type, current rating or minimum radius from the short description.
Why 18FO changes the design
The optical unit is not an accessory added outside the cable. Its location, buffer, strain control and bend envelope affect the complete laid-up construction.
The optical unit is not an accessory added outside the cable. Its location, buffer, strain control and bend envelope affect the complete laid-up construction.
Why the earth notation matters
The 2×70/2 arrangement influences fault-current capability, symmetry, screen bonding, cable balance and the termination package.
The 2×70/2 arrangement influences fault-current capability, symmetry, screen bonding, cable balance and the termination package.
3. Evidence and source hierarchy
| Reference | Useful contribution | How it is used here | Boundary |
|---|---|---|---|
| public trade-record search trace | A public trade-record page contains a longer related procurement description with the same 6/10 kV, 3×120, 2×70/2 and 18FO configuration. | Search trace only: it helps engineers locate the configuration in public procurement data. | It is not a manufacturer datasheet; no shipment weight, price or contact details are copied into this article. |
| IEC 60502-2 | IEC 60502-2 provides medium-voltage extruded-insulation cable construction and test context. | Use as a standard-verification reference when the purchaser specifies an MV product standard. | It does not by itself qualify a special reeling cable, integrated fibre unit or reel duty. |
| IEC 60794-3 | IEC 60794-3 provides optical-fibre cable specification context. | Use as a reference when establishing the optical test and documentation plan. | The integrated power-plus-fibre moving cable still needs project-specific mechanical and optical qualification. |
| IEC 60228 | IEC 60228 provides nominal conductor area, resistance and conductor-class framework. | Use after the exact flexible conductor construction is selected and released. | The reference does not prove the conductor class of this target. |
Public search evidence can establish a configuration trail. It cannot release the manufacturing drawing. The controlled Feichun quotation, construction drawing, test plan and certificate scope must govern the final cable.
4. Reference architecture
Figure 1 — Functional cross-section schematic. The power, earth and fibre elements are shown separately to explain the design logic; no unprovided layer dimension or material is asserted.
| Functional element | Engineering description | Required release information | Status |
|---|---|---|---|
| Three MV power cores | Three nominal 120 mm² cores laid up for medium-voltage reeling service. | Conductor material/class, strand design, insulation, screens, temperature, resistance and test values. | Size supplied; construction TBC |
| Two earth sections | Two sections represented by 70/2 notation in the buyer string. | Actual conductor geometry, copper area, screen/earth relationship, resistance, fault duty and termination. | Notation supplied |
| 18FO unit | An integrated optical-fibre element placed within the cable lay-up. | Fibre mode/grade, buffer, tube, strength member, attenuation, bandwidth, wavelength and connector plan. | Count supplied; design TBC |
| Mechanical reinforcement | A reinforcement/support system may be required to control torsion and tensile transfer. | Material, coverage, allowable load, end-grip method and dynamic test evidence. | Not supplied |
| Inner and outer sheath | Dynamic protective layers around the power, earth and fibre elements. | Compound, thickness, environmental resistance, marking and fire/chemical evidence. | Not supplied |
Electrical screen versus reinforcement
A metallic MV screen is an electrical field-control and fault-current element. A braid or textile reinforcement is a mechanical element. They must not be conflated.
A metallic MV screen is an electrical field-control and fault-current element. A braid or textile reinforcement is a mechanical element. They must not be conflated.
Optical unit must avoid the shortest radius
The fibre module should not become the most highly strained element when the cable enters the reel, guide or termination.
The fibre module should not become the most highly strained element when the cable enters the reel, guide or termination.
Earth path must be continuous
Earth sections, screens, clamps, glands and terminations need a documented bonding plan that matches the system protection study.
Earth sections, screens, clamps, glands and terminations need a documented bonding plan that matches the system protection study.
Dynamic sheath is an interface
The outer layer sees guide friction, layer pressure, oil, salt, dust, UV, water and repeated bending. Compound selection must follow the environment.
The outer layer sees guide friction, layer pressure, oil, salt, dust, UV, water and repeated bending. Compound selection must follow the environment.
5. Power, earth and fibre topology
Figure 2 — Interface topology. The MV termination, protective-earth/screen bond and optical fan-out should be designed as separate but coordinated interfaces.
| Interface zone | Power-side control | Earth-side control | Fibre-side control |
|---|---|---|---|
| Cable body | Conductor resistance, insulation, screen continuity, geometry and mechanical protection. | Continuity, resistance, fault-current path and separation from unintended tensile loads. | Fibre identification, continuity, attenuation, buffer integrity and bend protection. |
| Reel transition | No excessive local field stress, screen damage or conductor transfer of reel force into the termination. | No interruption or crushing of earth sections as the cable changes direction. | No tube crushing, microbend spike, fibre migration or excessive local curvature. |
| Machine termination | Correct MV accessory, screen cutback, phase identification and strain relief. | Correct bond, clamp, earth termination and protective coordination. | Correct fan-out, splice/connector, fibre mode and enclosure sealing. |
| Acceptance | MV routine/withstand/insulation/screen tests as specified by the project. | Earth continuity/resistance and fault-path inspection. | OTDR, insertion loss, continuity/polarity, end-face inspection and link budget. |
6. Exact target data matrix
This matrix preserves every technical field present in the supplied request and explicitly identifies missing release values. A TBC field is not a weakness in the article; it is the correct RFQ boundary for a cable whose original datasheet was not provided.
| Parameter | Target value / reading | Engineering use | Evidence |
|---|---|---|---|
| Raw procurement description | 6/10KV REELING CABLE 3CX120 & 2CX70/2+18FO | Keep this wording unchanged in RFQ, quotation, drawing and inspection records. | Supplied verbatim |
| Normalised designation | 6/10 kV reeling cable — 3×120 + 2×70/2 + 18FO | Technical working notation only; the purchaser’s string remains the traceability key. | Derived notation |
| Rated voltage U₀/U | 6/10 kV | MV insulation coordination, accessory selection and protection study. | Supplied |
| Power cores | 3×120 mm² | Three nominal power cores; confirm whether 120 mm² is per core. | Supplied |
| Earth notation | 2×70/2 | Split earth arrangement; actual area and geometry require confirmation. | Supplied; interpretation TBC |
| Optical fibre count | 18FO | 18 fibres integrated into the reeling cable. | Supplied |
| Conductor material / class | Not supplied | Controls resistance, flexibility, corrosion interface and termination preparation. | Project confirmation |
| MV insulation / screen | Not supplied | Controls field grading, partial discharge, earth-fault screen duty and termination cutback. | Project confirmation |
| Fibre mode / grade | Not supplied | Controls active equipment, attenuation, bandwidth, wavelength and link budget. | Project confirmation |
| Fibre buffer / strength member | Not supplied | Controls microbend, tensile transfer, crush resistance and termination method. | Project confirmation |
| Outer diameter / mass | Not supplied | Controls drum barrel, flange, guide, support, torque, transport and installation load. | Project confirmation |
| Current rating / voltage drop | Not supplied | Must be calculated for conductor arrangement, ambient, grouping, reel layers and duty cycle. | Project confirmation |
| Short-circuit rating | Not supplied | Requires conductor/screen/earth data and protection clearing time. | Project confirmation |
| Minimum dynamic radius | Not supplied | Controls reel, guide, pulley, festoon and termination geometry. | Project confirmation |
| Speed / acceleration / torsion / cycles | Not supplied | Defines dynamic fatigue and mechanical qualification. | Project confirmation |
| Environmental limits | Not supplied | Selects sheath compound and testing for oil, water, salt, UV, ozone, dust and temperature. | Project confirmation |
| Certificate scope | Not supplied | Must match the exact construction, market, plant and project application. | Project confirmation |
7. Electrical design boundary
Current is installation-specific
Do not copy a fixed-installation ampacity into a layered reel. Cable mass, adjacent turns, reel material, ambient air, duty cycle and dwell time may change the thermal result.
Do not copy a fixed-installation ampacity into a layered reel. Cable mass, adjacent turns, reel material, ambient air, duty cycle and dwell time may change the thermal result.
Voltage drop needs the actual loop
Use released conductor resistance at operating temperature, actual route length, power factor, frequency and terminal arrangement.
Use released conductor resistance at operating temperature, actual route length, power factor, frequency and terminal arrangement.
Short-circuit design needs all paths
Conductor, MV screen and earth arrangement must be evaluated with the protection clearing time and accessory limits.
Conductor, MV screen and earth arrangement must be evaluated with the protection clearing time and accessory limits.
Screen and earth are separate questions
Confirm whether the earth sections are also used for screen bonding, or whether a separate metallic screen exists.
Confirm whether the earth sections are also used for screen bonding, or whether a separate metallic screen exists.
Thermal screening: Iallow = f(R20, θamb, conductor temperature, grouping, reel-layer build-up, air movement, duty cycle)
Voltage drop: ΔU = I × L × (R(T) cosφ + X sinφ) — use released AC data and actual formation
Short circuit: I²t ≤ k²S² — use released material, temperature limits and clearing time
Dynamic screening: Rmachine ≥ Rmanufacturer; do not replace the released flat/reeling limit with a generic radius
Useful engineering result: the article can explain the calculation method, but it cannot responsibly publish a current rating for the exact 3×120 + 2×70/2 + 18FO cable without the installation and reel conditions.
8. Optical-fibre engineering
| Optical parameter | Why it matters | Required RFQ answer |
|---|---|---|
| Fibre mode / grade | Determines source, receiver, wavelength, attenuation, bandwidth and link budget. | Singlemode or multimode; exact fibre designation and operating wavelengths. |
| Buffer / tube architecture | Controls microbend protection, crush resistance, water behaviour and fan-out method. | Tight buffer, loose tube, bundle or other construction; material and dimensions. |
| Strength member | Controls tensile transfer and prevents power-core movement from loading the glass. | Material, allowable load, location and termination method. |
| Bend limits | Fibre may fail optically before the power cable shows visible damage. | Static and dynamic bend radius, reverse-bend/torsion limits and cycle test. |
| Optical acceptance | Confirms link quality after manufacturing and installation. | Continuity, polarity, OTDR, insertion loss, return loss where applicable and end-face inspection. |
Fibre count is not fibre performance. “18FO” establishes the count in the procurement wording. It does not establish mode, grade, attenuation, bandwidth, wavelength, connector type or link length. Those fields must be released before an optical-equivalent cable is quoted.
9. Reeling mechanics
Figure 3 — Reel mechanics. The exact diameter, radius, speed, acceleration, torsion and cycle-life values remain TBC because they are absent from the target description.
| Mechanical input | Failure mechanism if ignored | RFQ question |
|---|---|---|
| Drum barrel / flange | Layer build-up changes radius, pressure, torque and thermal dissipation. | Provide barrel diameter, flange diameter, cable length, layer count and winding direction. |
| Fleet angle / guide | Misalignment can fold the cable, load one edge or damage the fibre unit. | Provide guide width, radius, spacing, offset, edge protection and alignment tolerance. |
| Speed / acceleration | Dynamic tension increases at starts, stops, reversals and emergency braking. | State maximum speed, acceleration, braking, travel and cycle frequency. |
| Torsion | Twist can transfer into the optical unit and create local power-core or sheath stress. | State allowable torsion and how the machine prevents twist accumulation. |
| End restraint | Cable weight and acceleration can be transferred through copper, earth or fibre instead of a designed grip. | Provide clamp length, support method, bend exit and termination-entry geometry. |
| Environment | Oil, water, salt, dust, UV, ozone and temperature affect friction and material life. | Provide chemical list, ambient range, exposure and cleaning process. |
10. Application scenes
Figure 4 — Typical port and heavy-equipment contexts in which the combined electrical, optical and mechanical duty should be evaluated.
Ship-to-shore crane
Review MV drive supply, network/camera links, salt mist, festoon or reel geometry, EMC, wash-down and spreader interfaces.
Review MV drive supply, network/camera links, salt mist, festoon or reel geometry, EMC, wash-down and spreader interfaces.
Ship unloader
Check long travel, repeated acceleration, guide rollers, dust, impact, earth-fault path and fibre link continuity across the moving machine.
Check long travel, repeated acceleration, guide rollers, dust, impact, earth-fault path and fibre link continuity across the moving machine.
Stacker / conveyor
Check travel direction, reversals, slope, abrasion, dust, crushing, layer pressure and optical performance under motion.
Check travel direction, reversals, slope, abrasion, dust, crushing, layer pressure and optical performance under motion.
Motorised reel
Match cable mass, winding torque, layer build-up, brake behaviour, fleet angle, spare turns and end support to the reel drawing.
Match cable mass, winding torque, layer build-up, brake behaviour, fleet angle, spare turns and end support to the reel drawing.
11. Installation and failure-mode controls
| Observed problem | Likely mechanism | Preventive control |
|---|---|---|
| MV insulation failure | Radius below limit, screen damage, moisture ingress, termination stress or uncontrolled bending during handling. | Use the released handling radius, protect the screen, seal ends and follow the MV termination method. |
| Earth continuity loss | Broken earth section, bad bond, crushed conductor or termination looseness. | Test continuity/resistance before and after installation and inspect the full bond path. |
| Optical attenuation increase | Microbend, tight fan-out, crush, torsion, excessive radius or damaged buffer. | Perform OTDR and insertion-loss tests in the installed state and control the transition geometry. |
| Outer sheath damage | Sharp guide, edge loading, abrasion, chemical incompatibility or layer crossover. | Align guides, control winding, inspect contact surfaces and confirm compound compatibility. |
| Cable roll / twist lock | Off-axis entry, unequal layers, reverse torsion or uncontrolled payout. | Control winding direction, fleet angle, guide alignment and transition support. |
| Overtemperature | Ampacity copied from fixed installation or reel-layer heat trapped at full load. | Run the installed thermal calculation and record current and temperature during commissioning. |
| Termination pull-out | Mass and acceleration transferred through conductors, earth sections or optical fibres. | Use a designed clamp/grip and keep the cable bend exit within the controlled geometry. |
Commissioning sequence: inspect the stationary route first; verify the cable is not twisted, pinched or edge-loaded; travel slowly through the complete stroke; test MV/earth/optical functions separately; then increase speed and load in controlled stages while recording temperature, current, optical loss and abnormal noise.
12. Feichun functional equivalent
Feichun Cable can engineer a functional equivalent for the confirmed 6/10 kV, 3×120 + 2×70/2 + 18FO duty. The equivalent should be produced from an independent construction drawing and controlled material/test plan, matching the required electrical, optical and mechanical interfaces without copying a third party’s proprietary drawing, protected marking or undocumented design detail.
| Design gate | Feichun deliverable | Purchaser benefit |
|---|---|---|
| Duty capture | RFQ sheet covering current, system earthing, travel, speed, acceleration, radius, torsion, cycles, environment and optical link. | Prevents a size-only quotation from being used on the wrong machine. |
| Construction selection | Conductor, MV insulation/screen, earth layout, fibre unit, reinforcement and sheath design. | Creates a controlled power-plus-data interface. |
| Engineering release | Cross-section drawing, OD, mass, current tables, radius, tensile/support method, fibre data and marking plan. | Lets the reel, installer and purchaser work from the same numbers. |
| Verification | Electrical routine tests, optical acceptance tests, environmental evidence and agreed dynamic qualification. | Separates product evidence from general marketing language. |
| Traceability | Batch records, dimensional checks, conductor/screen results, optical test reports and final dossier. | Supports export inspection and future maintenance. |
13. Certification and documentation
Feichun Cable supports certification-oriented export projects. Depending on the ordered construction and target market, the documentation package can be coordinated around ATEX, IECEx, VDE, CE, UKCA, EAC and the Russian Fire Safety Certificate requirements. The exact certificate, scope and marking must be confirmed for the ordered power-plus-fibre construction; a certification name is not a product-specific certificate.
| Document / mark | Question to resolve | Release rule |
|---|---|---|
| ATEX / IECEx | Is the cable used within a classified explosive atmosphere or supplied as part of certified equipment? | Confirm zone, group, temperature class, equipment boundary and certificate scope. |
| VDE / CE | Which product standard, technical file or declaration applies to the ordered construction and market? | Match the declaration to the exact product, factory and applicable requirements. |
| UKCA / EAC | Which current market-conformity route and technical regulation apply? | Confirm the market documentation and importer/project requirements before shipment. |
| Russian Fire Safety Certificate | Does the tender or installation require a Russian fire-safety document for this cable? | Confirm exact scope, validity, language and product construction. |
| Factory dossier | Can the purchaser audit electrical, optical, dimensional, mechanical and batch evidence? | Provide the agreed inspection and test dossier with the shipment. |
14. RFQ release checklist
Figure 5 — RFQ release sequence for an independent Feichun equivalent.
| RFQ field | Minimum answer required | Reason |
|---|---|---|
| Cable identity | 6/10KV REELING CABLE 3CX120 & 2CX70/2+18FO | Preserves procurement traceability and prevents confusion with another 6/10 kV reeling configuration. |
| Power arrangement | 3×120 mm² confirmation, phase/core identification, conductor material/class and load profile. | Controls MV electrical and thermal design. |
| Earth arrangement | Meaning of 2×70/2, actual copper area, screen relationship, fault current and termination. | Controls protective continuity and accessory design. |
| Optical arrangement | 18 fibres, mode/grade, buffer, wavelength, attenuation, bandwidth, connectors, link length and acceptance test. | Controls the actual communications function. |
| Motion duty | Reel/festoon geometry, travel, speed, acceleration, cycles, torsion, minimum available radius and guides. | Enables dynamic qualification. |
| Environment | Ambient range, oil, water, salt, dust, UV, ozone, chemicals, impact and cleaning. | Selects sheath and material evidence. |
| Documents | Required standards, fire class, certificate scope, inspection plan and document language. | Defines the deliverable before production. |
Recommended RFQ sentence
Quote a Feichun independent functional equivalent to 6/10KV REELING CABLE 3CX120 & 2CX70/2+18FO; confirm the MV construction, earth layout, 18FO optical data, OD, mass, current, radius, tensile/support method, dynamic tests and certification scope for the stated machine.Do not leave the fibre line empty
“18FO” is a count, not a complete optical specification. The fibre mode, grade, attenuation, buffer, connector and link budget must be released before final quotation.
“18FO” is a count, not a complete optical specification. The fibre mode, grade, attenuation, buffer, connector and link budget must be released before final quotation.
15. Engineering summary
Recommended technical reading: this is a 6/10 kV combined reeling cable with three nominal 120 mm² power cores, a 2×70/2 earth notation and 18 integrated optical fibres. The configuration is technically meaningful for heavy moving equipment, but its safe equivalence depends on the unreleased construction and machine duty. Feichun should quote from an independent drawing, confirm the electrical/optical/mechanical data and attach product-specific test and certification documentation.
Feichun Cable technical contact
[email protected]
Technical RFQ, drawings, standards and certification scope
[email protected]
Technical RFQ, drawings, standards and certification scope
Source audit and publication note
- public trade-record search trace: public procurement search trace for a longer related description containing the same 6/10 kV, 3×120, 2×70/2 and 18FO configuration. It is not used as a datasheet or rating source.
- IEC 60502-2: medium-voltage cable standard context; product compliance is not claimed from the link alone.
- IEC 60794-3: optical-fibre cable reference context; the integrated dynamic cable still requires project-specific testing.
- IEC 60228: conductor area, resistance and conductor-class reference context.
Prepared for Feichun Cable on 05 August 2026. The raw procurement description is preserved. Missing values remain project-confirmation fields. No external contact details are reproduced.
